Your car is very likely to be running on gasoline blended with ethanol, a corn-based fuel, which has been touted recently as the answer to the dilemma of ever-increasing oil prices and emissions of greenhouse gases. There is a great debate about whether growing crops for fuel is an efficient use of the land and is as environmentally friendly as advocates of the technology would have us believe. While this debate rages, ethanol has been considered as a viable fuel for cars. However, it has been used in this capacity for a long time without optimization, making it questionable that it has a long term future as the answer to energy problems. Hydrogen gas in cars can offer improved fuel economy, and is a more recently available option in this field.